"The fossils are just fossils" - superficially that's correct but are you not familiar with the saying 'context determines meaning'?
The 'context' of any fossil is where it came to lie in the layers of rock that preserved it and what forms of life exist below (i.e. older) and above (i.e. younger) it in those strata.
The entire fossil record.
Vague
Actually, that fossil record is the opposite of vague. It is often very very specific.
The fossils are just fossils, the stories you apply to them are very specific. And even those stories leave more to wonder about than answer. Accepting common thoughts there are spurts of new life in the different earlier ages, so where did all of the new genetic information that drives the formation of life come from? Accepting common thoughts on how long it takes for changes to take place and the age of the universe, and earth and concerning how old the earth is, and from there subtracting how long it was before it was capable of life, is there enough time when you look at all of the changes in the fossil record when applying what was needed and what was available?